//- 💫 DOCS > API > TOP-LEVEL > UTIL

p
    |  spaCy comes with a small collection of utility functions located in
    |  #[+src(gh("spaCy", "spacy/util.py")) #[code spacy/util.py]].
    |  Because utility functions are mostly intended for
    |  #[strong internal use within spaCy], their behaviour may change with
    |  future releases. The functions documented on this page should be safe
    |  to use and we'll try to ensure backwards compatibility. However, we
    |  recommend having additional tests in place if your application depends on
    |  any of spaCy's utilities.

+h(3, "util.get_data_path") util.get_data_path
    +tag function

p
    |  Get path to the data directory where spaCy looks for models. Defaults to
    |  #[code spacy/data].

+table(["Name", "Type", "Description"])
    +row
        +cell #[code require_exists]
        +cell bool
        +cell Only return path if it exists, otherwise return #[code None].

    +row("foot")
        +cell returns
        +cell #[code Path] / #[code None]
        +cell Data path or #[code None].

+h(3, "util.set_data_path") util.set_data_path
    +tag function

p
    |  Set custom path to the data directory where spaCy looks for models.

+aside-code("Example").
    util.set_data_path('/custom/path')
    util.get_data_path()
    # PosixPath('/custom/path')

+table(["Name", "Type", "Description"])
    +row
        +cell #[code path]
        +cell unicode or #[code Path]
        +cell Path to new data directory.

+h(3, "util.get_lang_class") util.get_lang_class
    +tag function

p
    |  Import and load a #[code Language] class. Allows lazy-loading
    |  #[+a("/usage/adding-languages") language data] and importing
    |  languages using the two-letter language code. To add a language code
    |  for a custom language class, you can use the
    |  #[+api("top-level#util.set_lang_class") #[code set_lang_class]] helper.

+aside-code("Example").
    for lang_id in ['en', 'de']:
        lang_class = util.get_lang_class(lang_id)
        lang = lang_class()
        tokenizer = lang.Defaults.create_tokenizer()

+table(["Name", "Type", "Description"])
    +row
        +cell #[code lang]
        +cell unicode
        +cell Two-letter language code, e.g. #[code 'en'].

    +row("foot")
        +cell returns
        +cell #[code Language]
        +cell Language class.

+h(3, "util.set_lang_class") util.set_lang_class
    +tag function

p
    |  Set a custom #[code Language] class name that can be loaded via
    |  #[+api("top-level#util.get_lang_class") #[code get_lang_class]]. If
    |  your model uses a custom language, this is required so that spaCy can
    |  load the correct class from the two-letter language code.

+aside-code("Example").
    from spacy.lang.xy import CustomLanguage

    util.set_lang_class('xy', CustomLanguage)
    lang_class = util.get_lang_class('xy')
    nlp = lang_class()

+table(["Name", "Type", "Description"])
    +row
        +cell #[code name]
        +cell unicode
        +cell Two-letter language code, e.g. #[code 'en'].

    +row
        +cell #[code cls]
        +cell #[code Language]
        +cell The language class, e.g. #[code English].

+h(3, "util.load_model") util.load_model
    +tag function
    +tag-new(2)

p
    |  Load a model from a shortcut link, package or data path. If called with a
    |  shortcut link or package name, spaCy will assume the model is a Python
    |  package and import and call its #[code load()] method. If called with a
    |  path, spaCy will assume it's a data directory, read the language and
    |  pipeline settings from the meta.json and initialise a #[code Language]
    |  class. The model data will then be loaded in via
    |  #[+api("language#from_disk") #[code Language.from_disk()]].

+aside-code("Example").
    nlp = util.load_model('en')
    nlp = util.load_model('en_core_web_sm', disable=['ner'])
    nlp = util.load_model('/path/to/data')

+table(["Name", "Type", "Description"])
    +row
        +cell #[code name]
        +cell unicode
        +cell Package name, shortcut link or model path.

    +row
        +cell #[code **overrides]
        +cell -
        +cell Specific overrides, like pipeline components to disable.

    +row("foot")
        +cell returns
        +cell #[code Language]
        +cell #[code Language] class with the loaded model.

+h(3, "util.load_model_from_path") util.load_model_from_path
    +tag function
    +tag-new(2)

p
    |  Load a model from a data directory path. Creates the
    |  #[+api("language") #[code Language]] class and pipeline based on the
    |  directory's meta.json and then calls
    |  #[+api("language#from_disk") #[code from_disk()]] with the path. This
    |  function also makes it easy to test a new model that you haven't packaged
    |  yet.

+aside-code("Example").
    nlp = load_model_from_path('/path/to/data')

+table(["Name", "Type", "Description"])
    +row
        +cell #[code model_path]
        +cell unicode
        +cell Path to model data directory.

    +row
        +cell #[code meta]
        +cell dict
        +cell
            |  Model meta data. If #[code False], spaCy will try to load the
            |  meta from a meta.json in the same directory.

    +row
        +cell #[code **overrides]
        +cell -
        +cell Specific overrides, like pipeline components to disable.

    +row("foot")
        +cell returns
        +cell #[code Language]
        +cell #[code Language] class with the loaded model.

+h(3, "util.load_model_from_init_py") util.load_model_from_init_py
    +tag function
    +tag-new(2)

p
    |  A helper function to use in the #[code load()] method of a model package's
    |  #[+src(gh("spacy-models", "template/model/xx_model_name/__init__.py")) #[code __init__.py]].

+aside-code("Example").
    from spacy.util import load_model_from_init_py

    def load(**overrides):
        return load_model_from_init_py(__file__, **overrides)

+table(["Name", "Type", "Description"])
    +row
        +cell #[code init_file]
        +cell unicode
        +cell Path to model's __init__.py, i.e. #[code __file__].

    +row
        +cell #[code **overrides]
        +cell -
        +cell Specific overrides, like pipeline components to disable.

    +row("foot")
        +cell returns
        +cell #[code Language]
        +cell #[code Language] class with the loaded model.

+h(3, "util.get_model_meta") util.get_model_meta
    +tag function
    +tag-new(2)

p
    |  Get a model's meta.json from a directory path and validate its contents.

+aside-code("Example").
    meta = util.get_model_meta('/path/to/model')

+table(["Name", "Type", "Description"])
    +row
        +cell #[code path]
        +cell unicode or #[code Path]
        +cell Path to model directory.

    +row("foot")
        +cell returns
        +cell dict
        +cell The model's meta data.

+h(3, "util.is_package") util.is_package
    +tag function

p
    |  Check if string maps to a package installed via pip. Mainly used to
    |  validate #[+a("/usage/models") model packages].

+aside-code("Example").
    util.is_package('en_core_web_sm') # True
    util.is_package('xyz') # False

+table(["Name", "Type", "Description"])
    +row
        +cell #[code name]
        +cell unicode
        +cell Name of package.

    +row("foot")
        +cell returns
        +cell #[code bool]
        +cell #[code True] if installed package, #[code False] if not.

+h(3, "util.get_package_path") util.get_package_path
    +tag function
    +tag-new(2)

p
    |  Get path to an installed package. Mainly used to resolve the location of
    |  #[+a("/usage/models") model packages]. Currently imports the package
    |  to find its path.

+aside-code("Example").
    util.get_package_path('en_core_web_sm')
    # /usr/lib/python3.6/site-packages/en_core_web_sm

+table(["Name", "Type", "Description"])
    +row
        +cell #[code package_name]
        +cell unicode
        +cell Name of installed package.

    +row("foot")
        +cell returns
        +cell #[code Path]
        +cell Path to model package directory.

+h(3, "util.is_in_jupyter") util.is_in_jupyter
    +tag function
    +tag-new(2)

p
    |  Check if user is running spaCy from a #[+a("https://jupyter.org") Jupyter]
    |  notebook by detecting the IPython kernel. Mainly used for the
    |  #[+api("top-level#displacy") #[code displacy]] visualizer.

+aside-code("Example").
    html = '&lt;h1&gt;Hello world!&lt;/h1&gt;'
    if util.is_in_jupyter():
        from IPython.core.display import display, HTML
        return display(HTML(html))

+table(["Name", "Type", "Description"])
    +row("foot")
        +cell returns
        +cell bool
        +cell #[code True] if in Jupyter, #[code False] if not.

+h(3, "util.update_exc") util.update_exc
    +tag function

p
    |  Update, validate and overwrite
    |  #[+a("/usage/adding-languages#tokenizer-exceptions") tokenizer exceptions].
    |  Used to combine global  exceptions with custom, language-specific
    |  exceptions. Will raise an error if key doesn't match #[code ORTH] values.

+aside-code("Example").
    BASE =  {"a.": [{ORTH: "a."}], ":)": [{ORTH: ":)"}]}
    NEW = {"a.": [{ORTH: "a.", LEMMA: "all"}]}
    exceptions = util.update_exc(BASE, NEW)
    # {"a.": [{ORTH: "a.", LEMMA: "all"}], ":)": [{ORTH: ":)"}]}

+table(["Name", "Type", "Description"])
    +row
        +cell #[code base_exceptions]
        +cell dict
        +cell Base tokenizer exceptions.

    +row
        +cell #[code *addition_dicts]
        +cell dicts
        +cell Exception dictionaries to add to the base exceptions, in order.

    +row("foot")
        +cell returns
        +cell dict
        +cell Combined tokenizer exceptions.


+h(3, "util.prints") util.prints
    +tag function
    +tag-new(2)

p
    |  Print a formatted, text-wrapped message with optional title. If a text
    |  argument is a #[code Path], it's converted to a string. Should only
    |  be used for interactive components like the command-line interface.

+aside-code("Example").
    data_path = Path('/some/path')
    if not path.exists():
        util.prints("Can't find the path.", data_path,
                    title="Error", exits=1)

+table(["Name", "Type", "Description"])
    +row
        +cell #[code *texts]
        +cell unicode
        +cell Texts to print. Each argument is rendered as paragraph.

    +row
        +cell #[code **kwargs]
        +cell -
        +cell
            |  #[code title] is rendered as coloured headline. #[code exits]
            |  performs system exit after printing, using the value of the
            |  argument as the exit code, e.g. #[code exits=1].


+h(3, "util.minibatch") util.minibatch
    +tag function
    +tag-new(2)

p
    |  Iterate over batches of items. #[code size] may be an iterator, so that
    |  batch-size can vary on each step.

+aside-code("Example").
    batches = minibatch(train_data)
    for batch in batches:
        texts, annotations = zip(*batch)
        nlp.update(texts, annotations)

+table(["Name", "Type", "Description"])
    +row
        +cell #[code items]
        +cell iterable
        +cell The items to batch up.

    +row
        +cell #[code size]
        +cell int / iterable
        +cell
            |  The batch size(s). Use
            |  #[+api("top-level#util.compounding") #[code util.compounding]] or
            |  #[+api("top-level#util.decaying") #[code util.decaying]] or
            |  for an infinite series of compounding or decaying values.

    +row("foot")
        +cell yields
        +cell list
        +cell The batches.

+h(3, "util.compounding") util.compounding
    +tag function
    +tag-new(2)

p
    |  Yield an infinite series of compounding values. Each time the generator
    |  is called, a value is produced by multiplying the previous value by the
    |  compound rate.

+aside-code("Example").
    sizes = compounding(1., 10., 1.5)
    assert next(sizes) == 1.
    assert next(sizes) == 1. * 1.5
    assert next(sizes) == 1.5 * 1.5

+table(["Name", "Type", "Description"])
    +row
        +cell #[code start]
        +cell int / float
        +cell The first value.

    +row
        +cell #[code stop]
        +cell int / float
        +cell The maximum value.

    +row
        +cell #[code compound]
        +cell int / float
        +cell The compounding factor.

    +row("foot")
        +cell yields
        +cell int
        +cell Compounding values.

+h(3, "util.decaying") util.decaying
    +tag function
    +tag-new(2)

p
    |  Yield an infinite series of linearly decaying values.

+aside-code("Example").
    sizes = decaying(1., 10., 0.001)
    assert next(sizes) == 1.
    assert next(sizes) == 1. - 0.001
    assert next(sizes) == 0.999 - 0.001

+table(["Name", "Type", "Description"])
    +row
        +cell #[code start]
        +cell int / float
        +cell The first value.

    +row
        +cell #[code end]
        +cell int / float
        +cell The maximum value.

    +row
        +cell #[code decay]
        +cell int / float
        +cell The decaying factor.

    +row("foot")
        +cell yields
        +cell int
        +cell The decaying values.

+h(3, "util.itershuffle") util.itershuffle
    +tag function
    +tag-new(2)

p
    |  Shuffle an iterator. This works by holding #[code bufsize] items back and
    |  yielding them sometime later. Obviously, this is not unbiased – but
    |  should be good enough for batching. Larger bufsize means less bias.

+aside-code("Example").
    values = range(1000)
    shuffled = itershuffle(values)

+table(["Name", "Type", "Description"])
    +row
        +cell #[code iterable]
        +cell iterable
        +cell Iterator to shuffle.

    +row
        +cell #[code buffsize]
        +cell int
        +cell Items to hold back.

    +row("foot")
        +cell yields
        +cell iterable
        +cell The shuffled iterator.
